US3899893A - Anchoring pin and method for structures such as mine and tunnel roofs and side walls - Google Patents

Anchoring pin and method for structures such as mine and tunnel roofs and side walls Download PDF

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US3899893A
US3899893A US430407A US43040774A US3899893A US 3899893 A US3899893 A US 3899893A US 430407 A US430407 A US 430407A US 43040774 A US43040774 A US 43040774A US 3899893 A US3899893 A US 3899893A
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pin
leading
anchoring
hole
leading portion
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US430407A
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Bani R Banerjee
Mukund D Gangal
Sigmund Black
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Lee Norse Co
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Lee Norse Co
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts

Definitions

  • ABSTRACT An anchoring pin comprising an enlarged leading por tion having a leading face for enlarging a smaller predrilled hole during longitudinal insertion of the pin therein, the pin body having a longitudinal bore which opens through its leading end for discharge of material broken-up and displaced by said leading portion during such enlargement of the hole.
  • an anchoring method comprising the steps of forming a hole in the structure to be anchored, providing a said anchoring pin having a leading portion of greater peripheral dimension than the formed hole, and inserting the pin into the hole to cause the pin leading portion to enlarge the hole while material displaced by such enlargemcnt is discharged through the pin contained bore.
  • An object of the present invention is to provide a new and improved anchoring pin particularly adapted for anchoring structures such as mine and tunnel roofs and side walls, which anchoring pin is both relatively ecconomical in construction and highly efficient in operation.
  • Another object of the invention is to provide a new and improved anchoring pin of the type set forth which is of a design readily adaptable for employment in structures of varying strengths.
  • Another object is to provide a new and improved anchoring pin of the type set forth which is of a design permitting control of the force required for insertion of the pin in the structures whereby such requisite insertion force may be minimized.
  • Another object is to provide a new and improved anchoring pin of the type set forth which is particularly adapted to provide both suspension support and compressed layer beam support of the anchored structures.
  • Another object is to provide a new and improved anchoring pin of the type set forth which is particularly constructed and arranged to posess significant resistance to undesirable buckling and bending.
  • Another object is to provide a new and improved anchoring method particularly adapted for anchoring structures such as mine and tunnel roofs and side walls through the employment of such an anchoring pin.
  • structures such as mine and tunnel roofs and side walls may be anchored by a method comprising the steps of forming a hole in the structure to be anchored, providing an anchoring pin having an enlarged leading portion adjacent its leading end of peripheral dimension greater than that of the formed hole and also having a longitudinal bore which opens through its said leading end and inserting said anchoring pin into said formed hole to cause said leading portion to enlarge said hole during said pin insertion while material displaced by such enlargement is discharged through said pin body contained bore.
  • FIG. 1 is a view in perspective illustrating one embodiment of anchoring pin constructed in accordance with the invention.
  • FIGS. 2 through 4 are views diagramatically illustrating the anchoring of a mine or tunnel roof by the embodiment of anchoring pin shown in FIG. 1.
  • the illustrated anchoring pin 10 comprises an annular elongated steel body 12 having a forward or leading end 14 and a rearward or trailing end 16.
  • the body 12 contains an axial bore 18 which longitudinally extends throughout the length of the body 12 and opens through the body leading and trailing ends 14, 16, respectively, the bore 18, as hereinafter described, serving for discharge of material broken-up and displaced during insertion of the pin 10 in the structure to be anchored.
  • the body 12 is circumferentially imperforate and a complete annulus, that is, the body 12 contains no longitudinal slit or opening through its circumferential wall.
  • the body 12 may be, for example, of from one to six feet in length and is rigid, although sufficiently capable of bending for employment in applications such as shallow seam mining operations where the roof to be anchored may be lower than the length of the body 12.
  • the body 12 Adjacent to its leading end 14, the body 12 includes an integral, substantially enlarged, constant crosssection, annular leading portion 20 of peripheral dimension P substantially greater than the peripheral dimension P of the immediately thereafter following intermediate or shank portion 22 of the body 12. It is believed that the outer diameter D, of the leading portion 20 should be at least one-thirty-second of an inch larger than the outer diameter D of the intermediate portion 22 and also that such outer diameter D, should be at least onequarter of an inch, and even more preferably one-half of an inch to allow greater hole tolerance, larger than the diameter D of the preformed hole 24 in which the pin 10 is to be installed.
  • the leading portion 20 includes a transversely extending, annular leading face 26 which forms the leading end 14 of the body 12, such leading face 26, as illustrated, extending normal to the axis of the body 12 and serving during the hereinafter described pin installation for enlarging the smaller hole 24 to the larger size of the leading portion 20.
  • the length of the leading portion 20 (that is, the dimension of the leading portion 20 longitudinally of the body 12) is only a minor portion of the length of the body 12 and variable in different embodiments to maintain the force required for the pin installation at a minimum level while still providing the desired anchoring.
  • a leading portion length of four inches has been found to be adequate for developing up to twelve thousand pounds of pull-out force during testing of the described pin 10 in concrete.
  • the length of the leading portion 20 could be appropriately reduced to correspondingly reduce the required insertion force as high pull-out forces can be achieved in strong structures with a relatively short length of leading portion 20.
  • the body 12 At its trailing end 16, the body 12 includes an integral enlarged head 28; and a supporting plate 30 is mounted peripherally around the body intermediate portion 22 for slidable movement longitudinally of the body 12, the head 28 serving after installation of the pin 10 to maintain the supporting plate 30 in supporting position adjacent to the outer surface of the structure being anchored.
  • FIGS. 2 through 4 The installation of the pin in a structure such as a mine or tunnel roof 32 is schematically depicted in FIGS. 2 through 4.
  • a hole 24 of the beforedescribed diameter D that is, a hole 24 of diameter substantially smaller than the diameter D of the pin leading portion is first drilled in the roof 32 by a conventional drill bit 34 rotatably driven through a drill steel 36. Then, the drill steel 36 and bit 34 are removed from the formed hole 24; and the pin 10 is longitudinally driven, leading end 14 first, into the hole 24 by a conventional push cylinder and/or impact driving means.
  • a conventional drill bit 34 rotatably driven through a drill steel 36.
  • the pin 10 during its insertion is supported by a support 38 and driven therethrough by, for example, a conventional roof drill-and-bolter of the general type described in US. Pat. No. 3,756,669, issued Sept. 4, 1973 and assigned to the assignee of the present invention.
  • a conventional roof drill-and-bolter of the general type described in US. Pat. No. 3,756,669, issued Sept. 4, 1973 and assigned to the assignee of the present invention.
  • the leading face 26 of the pin leading portion 20 compresses, crushes and displaces the rock adjacent the edges of the hole 24 to enlarge the latter to its diameter D,.
  • the rock displaced by the pin insertion is discharged longitudinally through the pin contained bore 18 and a communicating bore 40 in the support 48 to a suitable place of discharge.
  • the pin insertion causes the supporting plate to be downwardly slidably moved along the pin intermediate portion 22; and, after the pin 10 has been fully longitudinally installed in the bore 24, the supporting plate 30 is, as shown in FIG. 4, affixed below the outer or lower level 42 of the roof 32 by the enlarged head 28.
  • the supporting plate 30 provides suspension support of the roof 32 while the leading portion 20 provides a strong elastic force pressing against the wall of the now enlarged hole 24 for compressed layer beam support of the roof 32.
  • the pin 10 resultantly thereby provides a positive anchor for such roof 32.
  • An anchoring pin for anchoring structures such as mine and tunnel roofs and side walls, comprising an elongated body having a leading end and a trailing end,
  • said body adjacent its said leading end including a leading portion of peripheral dimension greater than that of a thereafter following portion of said body, said leading portion being of outer diameter larger than the outer diameter of said following portion of said body, said leading portion having an annular leading face extendingtransversely of the axis of said body capable of breaking-up and displacing material to cause lateral enlargement of a smaller diameter hole during driven insertion of the pin, leading end first, therein, and said body having an axial bore which opens through its said leading and trailing ends for discharge of material broken-up and displaced by said leading face during such pin driven insertion.
  • leading portion is of outer diameter at least oneeighth of an inch larger than the outer diameter of said thereafter following portion of said body, said body is a complete annulus, said leading portion is, longitudinally of said body, only a minor portion of the length of said body, said leading face extends normal to the axis of said body, and further comprising supporting plate means slidably carried by said body intermediate its ends.
  • a method for anchoring structures such as mine and tunnel roofs and side wall, comprising the steps of forming a hole in the structure to be anchored, providing an elongated annular anchoring pin including a transversely enlarged leading portion adjacent its leading end of outer diameter substantially greater than the diameter of said formed hole and having a transversely extending annular leading face capable of breaking-up and displacing material to laterally enlarge a smaller diameter hole, longitudinally driving said anchoring pin, leading end first, into said formed hole to cause said leading face of said leading portion to break-up and displace material adjacent the edges of said formed hole and thereby laterally enlarge said formed hole while said pin is so driven therein, during such driving of said pin discharging said broken-up and displaced material from the hole through an axial bore formed longitudinally through said anchoring pin, and employing the elastic force of the thus installed pin against the wall of the enlarged bore for anchoring the structure.
  • An anchoring method further comprising the steps of, during said driving of said pin, causing a supporting plate to slide rearwardly on said anchoring pin, and employing said supporting plate, after the installation of said pin, for providing suspension support of the structure.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Lining And Supports For Tunnels (AREA)

Abstract

An anchoring pin comprising an enlarged leading portion having a leading face for enlarging a smaller pre-drilled hole during longitudinal insertion of the pin therein, the pin body having a longitudinal bore which opens through its leading end for discharge of material broken-up and displaced by said leading portion during such enlargement of the hole. Also, an anchoring method comprising the steps of forming a hole in the structure to be anchored, providing a said anchoring pin having a leading portion of greater peripheral dimension than the formed hole, and inserting the pin into the hole to cause the pin leading portion to enlarge the hole while material displaced by such enlargement is discharged through the pin contained bore.

Description

United States Patent 11 1 Banerjee et al.
1 1 ANCHORING PIN AND METHOD FOR STRUCTURES SUCH AS MINE AND TUNNEL ROOFS AND SIDE WALLS [75] Inventors: Bani R. Banerjee, Skillman;
Mukund D. Gangal, Plainshoro; Sigmund Black, Belle Mead all of [73] Assignce: Lee-Norse Company, Charleroi, Pa.
[22] Filed: Jan. 3, 1974 [21 Appl. No.: 430,407
1 Aug. 19, 1975 Williams 61/45 B Banerjee et a1 83/30 [57] ABSTRACT An anchoring pin comprising an enlarged leading por tion having a leading face for enlarging a smaller predrilled hole during longitudinal insertion of the pin therein, the pin body having a longitudinal bore which opens through its leading end for discharge of material broken-up and displaced by said leading portion during such enlargement of the hole. Also, an anchoring method comprising the steps of forming a hole in the structure to be anchored, providing a said anchoring pin having a leading portion of greater peripheral dimension than the formed hole, and inserting the pin into the hole to cause the pin leading portion to enlarge the hole while material displaced by such enlargemcnt is discharged through the pin contained bore.
5 Claims, 4 Drawing Figures ANCHORING PIN AND METHOD FOR STRUCTURES SUCH AS MINE AND TUNNEL ROOFS AND SIDE WALLS The present invention relates to anchoring pins and anchoring methods particularly adapted for anchoring structures such as mine and tunnel roofs and side walls.
An object of the present invention is to provide a new and improved anchoring pin particularly adapted for anchoring structures such as mine and tunnel roofs and side walls, which anchoring pin is both relatively ecconomical in construction and highly efficient in operation.
Another object of the invention is to provide a new and improved anchoring pin of the type set forth which is of a design readily adaptable for employment in structures of varying strengths.
Another object is to provide a new and improved anchoring pin of the type set forth which is of a design permitting control of the force required for insertion of the pin in the structures whereby such requisite insertion force may be minimized.
Another object is to provide a new and improved anchoring pin of the type set forth which is particularly adapted to provide both suspension support and compressed layer beam support of the anchored structures.
Another object is to provide a new and improved anchoring pin of the type set forth which is particularly constructed and arranged to posess significant resistance to undesirable buckling and bending.
Another object is to provide a new and improved anchoring method particularly adapted for anchoring structures such as mine and tunnel roofs and side walls through the employment of such an anchoring pin.
Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings wherein, as will be understood, the preferred form of the invention has been shown by way of illustration only.
In accordance with the invention, an anchoring pin for anchoring structures such as mine and tunnel roofs and side walls may comprise a body having a leading end and a trailing end, said body adjacent its said leading end including a leading portion of peripheral dimension greater than that of a thereafter following portion of said body, said leading portion having a leading face for displacing material to cause enlargement of a smaller pre-drilled hole during insertion of the pin therein, and said body having a longitudinal bore which opens through its said leading end for discharge of material displaced by said leading portion during such enlargement of the hole.
Also, in accordance with the invention, structures such as mine and tunnel roofs and side walls may be anchored by a method comprising the steps of forming a hole in the structure to be anchored, providing an anchoring pin having an enlarged leading portion adjacent its leading end of peripheral dimension greater than that of the formed hole and also having a longitudinal bore which opens through its said leading end and inserting said anchoring pin into said formed hole to cause said leading portion to enlarge said hole during said pin insertion while material displaced by such enlargement is discharged through said pin body contained bore.
Referring to the drawings:
FIG. 1 is a view in perspective illustrating one embodiment of anchoring pin constructed in accordance with the invention; and
FIGS. 2 through 4 are views diagramatically illustrating the anchoring of a mine or tunnel roof by the embodiment of anchoring pin shown in FIG. 1.
Referring more particularly to the drawings wherein similar reference characters designate corresponding parts throughout the several views, the illustrated anchoring pin 10 comprises an annular elongated steel body 12 having a forward or leading end 14 and a rearward or trailing end 16. The body 12 contains an axial bore 18 which longitudinally extends throughout the length of the body 12 and opens through the body leading and trailing ends 14, 16, respectively, the bore 18, as hereinafter described, serving for discharge of material broken-up and displaced during insertion of the pin 10 in the structure to be anchored. The body 12 is circumferentially imperforate and a complete annulus, that is, the body 12 contains no longitudinal slit or opening through its circumferential wall. The body 12 may be, for example, of from one to six feet in length and is rigid, although sufficiently capable of bending for employment in applications such as shallow seam mining operations where the roof to be anchored may be lower than the length of the body 12.
Adjacent to its leading end 14, the body 12 includes an integral, substantially enlarged, constant crosssection, annular leading portion 20 of peripheral dimension P substantially greater than the peripheral dimension P of the immediately thereafter following intermediate or shank portion 22 of the body 12. It is believed that the outer diameter D, of the leading portion 20 should be at least one-thirty-second of an inch larger than the outer diameter D of the intermediate portion 22 and also that such outer diameter D, should be at least onequarter of an inch, and even more preferably one-half of an inch to allow greater hole tolerance, larger than the diameter D of the preformed hole 24 in which the pin 10 is to be installed. The leading portion 20 includes a transversely extending, annular leading face 26 which forms the leading end 14 of the body 12, such leading face 26, as illustrated, extending normal to the axis of the body 12 and serving during the hereinafter described pin installation for enlarging the smaller hole 24 to the larger size of the leading portion 20. The length of the leading portion 20 (that is, the dimension of the leading portion 20 longitudinally of the body 12) is only a minor portion of the length of the body 12 and variable in different embodiments to maintain the force required for the pin installation at a minimum level while still providing the desired anchoring. By way of specific example, a leading portion length of four inches has been found to be adequate for developing up to twelve thousand pounds of pull-out force during testing of the described pin 10 in concrete.
Moreover, for the anchoring of stronger structures, the length of the leading portion 20 could be appropriately reduced to correspondingly reduce the required insertion force as high pull-out forces can be achieved in strong structures with a relatively short length of leading portion 20.
At its trailing end 16, the body 12 includes an integral enlarged head 28; and a supporting plate 30 is mounted peripherally around the body intermediate portion 22 for slidable movement longitudinally of the body 12, the head 28 serving after installation of the pin 10 to maintain the supporting plate 30 in supporting position adjacent to the outer surface of the structure being anchored.
The installation of the pin in a structure such as a mine or tunnel roof 32 is schematically depicted in FIGS. 2 through 4. In such installation, a hole 24 of the beforedescribed diameter D (that is, a hole 24 of diameter substantially smaller than the diameter D of the pin leading portion is first drilled in the roof 32 by a conventional drill bit 34 rotatably driven through a drill steel 36. Then, the drill steel 36 and bit 34 are removed from the formed hole 24; and the pin 10 is longitudinally driven, leading end 14 first, into the hole 24 by a conventional push cylinder and/or impact driving means. As schematically depicted in FIG. 3, the pin 10 during its insertion is supported by a support 38 and driven therethrough by, for example, a conventional roof drill-and-bolter of the general type described in US. Pat. No. 3,756,669, issued Sept. 4, 1973 and assigned to the assignee of the present invention. During such longitudinal insertion of the pin 10 into the preformed hole 24, the leading face 26 of the pin leading portion 20 compresses, crushes and displaces the rock adjacent the edges of the hole 24 to enlarge the latter to its diameter D,. The rock displaced by the pin insertion is discharged longitudinally through the pin contained bore 18 and a communicating bore 40 in the support 48 to a suitable place of discharge. The pin insertion causes the supporting plate to be downwardly slidably moved along the pin intermediate portion 22; and, after the pin 10 has been fully longitudinally installed in the bore 24, the supporting plate 30 is, as shown in FIG. 4, affixed below the outer or lower level 42 of the roof 32 by the enlarged head 28. Hence, after such installation, the supporting plate 30 provides suspension support of the roof 32 while the leading portion 20 provides a strong elastic force pressing against the wall of the now enlarged hole 24 for compressed layer beam support of the roof 32. The pin 10 resultantly thereby provides a positive anchor for such roof 32.
From the preceding description, it will be seen that the invention provides a new and improved anchor pin and anchoring method for accomplishing all of the beforestated objects and advantages. It will be understood however, that, although only a single embodiment of the invention has been illustrated and hereinbefore specifically described, the invention is not limited merely to this single embodiment, but rather contemplates other embodiments and variations within the scope of the following claims.
Having thus described our invention, we claim:
1. An anchoring pin for anchoring structures such as mine and tunnel roofs and side walls, comprising an elongated body having a leading end and a trailing end,
said body adjacent its said leading end including a leading portion of peripheral dimension greater than that of a thereafter following portion of said body, said leading portion being of outer diameter larger than the outer diameter of said following portion of said body, said leading portion having an annular leading face extendingtransversely of the axis of said body capable of breaking-up and displacing material to cause lateral enlargement of a smaller diameter hole during driven insertion of the pin, leading end first, therein, and said body having an axial bore which opens through its said leading and trailing ends for discharge of material broken-up and displaced by said leading face during such pin driven insertion.
2. An anchoring pin according to claim 1, wherein said leading portion is of outer diameter at least oneeighth of an inch larger than the outer diameter of said thereafter following portion of said body, said body is a complete annulus, said leading portion is, longitudinally of said body, only a minor portion of the length of said body, said leading face extends normal to the axis of said body, and further comprising supporting plate means slidably carried by said body intermediate its ends.
3. A method for anchoring structures such as mine and tunnel roofs and side wall, comprising the steps of forming a hole in the structure to be anchored, providing an elongated annular anchoring pin including a transversely enlarged leading portion adjacent its leading end of outer diameter substantially greater than the diameter of said formed hole and having a transversely extending annular leading face capable of breaking-up and displacing material to laterally enlarge a smaller diameter hole, longitudinally driving said anchoring pin, leading end first, into said formed hole to cause said leading face of said leading portion to break-up and displace material adjacent the edges of said formed hole and thereby laterally enlarge said formed hole while said pin is so driven therein, during such driving of said pin discharging said broken-up and displaced material from the hole through an axial bore formed longitudinally through said anchoring pin, and employing the elastic force of the thus installed pin against the wall of the enlarged bore for anchoring the structure.
4. An anchoring method according to claim 3, wherein the provided pin includes a leading portion of outer diameter at least one-quarter of an inch greater than the diameter of the formed hole.
5. An anchoring method according to claim 3, further comprising the steps of, during said driving of said pin, causing a supporting plate to slide rearwardly on said anchoring pin, and employing said supporting plate, after the installation of said pin, for providing suspension support of the structure.

Claims (5)

1. An anchoring pin for anchoring structures such as mine and tunnel roofs and side walls, comprising an elongated body having a leading end and a trailing end, said body adjacent its said leading end including a leading portion of peripheral dimension greater than that of a thereafter following portion of said body, said leading portion being of outer diameter larger than the outer diameter of said following portion of said body, said leading portion having an annular leading face extending transversely of the axis of said body capable of breaking-up and displacing material to cause lateral enlargement of a smaller diameter hole during driven insertion of the pin, leading end first, therein, and said body having an axial bore which opens through its said leading and trailing ends for discharge of material broken-up and displaced by said leading face during such pin driven insertion.
2. An anchoring pin according to claim 1, wherein said leading portion is of outer diameter at least one-eighth of an inch larger than the outer diameter of saiD thereafter following portion of said body, said body is a complete annulus, said leading portion is, longitudinally of said body, only a minor portion of the length of said body, said leading face extends normal to the axis of said body, and further comprising supporting plate means slidably carried by said body intermediate its ends.
3. A method for anchoring structures such as mine and tunnel roofs and side wall, comprising the steps of forming a hole in the structure to be anchored, providing an elongated annular anchoring pin including a transversely enlarged leading portion adjacent its leading end of outer diameter substantially greater than the diameter of said formed hole and having a transversely extending annular leading face capable of breaking-up and displacing material to laterally enlarge a smaller diameter hole, longitudinally driving said anchoring pin, leading end first, into said formed hole to cause said leading face of said leading portion to break-up and displace material adjacent the edges of said formed hole and thereby laterally enlarge said formed hole while said pin is so driven therein, during such driving of said pin discharging said broken-up and displaced material from the hole through an axial bore formed longitudinally through said anchoring pin, and employing the elastic force of the thus installed pin against the wall of the enlarged bore for anchoring the structure.
4. An anchoring method according to claim 3, wherein the provided pin includes a leading portion of outer diameter at least one-quarter of an inch greater than the diameter of the formed hole.
5. An anchoring method according to claim 3, further comprising the steps of, during said driving of said pin, causing a supporting plate to slide rearwardly on said anchoring pin, and employing said supporting plate, after the installation of said pin, for providing suspension support of the structure.
US430407A 1974-01-03 1974-01-03 Anchoring pin and method for structures such as mine and tunnel roofs and side walls Expired - Lifetime US3899893A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4055051A (en) * 1976-01-08 1977-10-25 The United States Of America As Represented By The Secretary Of The Interior Unitary drill bit and roof bolt
US4278363A (en) * 1979-06-21 1981-07-14 Conoco, Inc. Rock bolt and installation system
US4289426A (en) * 1979-09-14 1981-09-15 Ingersoll-Rand Company Friction rock stabilizer and method of forming same, and a method of stabilizing an earth structure
US4313695A (en) * 1980-01-07 1982-02-02 Ingersoll-Rand Company Earth structure stabilizing method, and a friction rock stabilizer and an axial extension therefor
US4325657A (en) * 1979-12-05 1982-04-20 Elders G W Roof support pin
US4502818A (en) * 1980-03-28 1985-03-05 Elders G W Roof support pin
US5147151A (en) * 1991-08-23 1992-09-15 Hipkins Jr Edward C Washer insert for bearing plate
US20110052332A1 (en) * 2009-09-01 2011-03-03 Fci Holdings Delaware, Inc. Yielding Bolt and Assembly
US8801337B2 (en) * 2008-01-11 2014-08-12 Dsi Underground Systems, Inc. Method of using a dome headed roof bolt

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1963301A (en) * 1932-10-20 1934-06-19 Gloystein Friedrich Hollow dowel
US2963935A (en) * 1956-08-10 1960-12-13 John H Van Moss Jr Expanding anchor and plug with an exhaust passage
US3377807A (en) * 1966-06-15 1968-04-16 Nave Vincent Anchor bolt assembly
US3643542A (en) * 1970-01-02 1972-02-22 Pin Set Corp Mine roof pins and apparatus for setting the same
US3653217A (en) * 1970-08-03 1972-04-04 Chester I Williams Rock bolt rod configuration
US3832930A (en) * 1973-04-16 1974-09-03 Lee Norse Co Pins for mine and tunnel roofs and other structures

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1963301A (en) * 1932-10-20 1934-06-19 Gloystein Friedrich Hollow dowel
US2963935A (en) * 1956-08-10 1960-12-13 John H Van Moss Jr Expanding anchor and plug with an exhaust passage
US3377807A (en) * 1966-06-15 1968-04-16 Nave Vincent Anchor bolt assembly
US3643542A (en) * 1970-01-02 1972-02-22 Pin Set Corp Mine roof pins and apparatus for setting the same
US3653217A (en) * 1970-08-03 1972-04-04 Chester I Williams Rock bolt rod configuration
US3832930A (en) * 1973-04-16 1974-09-03 Lee Norse Co Pins for mine and tunnel roofs and other structures

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4055051A (en) * 1976-01-08 1977-10-25 The United States Of America As Represented By The Secretary Of The Interior Unitary drill bit and roof bolt
US4278363A (en) * 1979-06-21 1981-07-14 Conoco, Inc. Rock bolt and installation system
US4289426A (en) * 1979-09-14 1981-09-15 Ingersoll-Rand Company Friction rock stabilizer and method of forming same, and a method of stabilizing an earth structure
US4325657A (en) * 1979-12-05 1982-04-20 Elders G W Roof support pin
US4313695A (en) * 1980-01-07 1982-02-02 Ingersoll-Rand Company Earth structure stabilizing method, and a friction rock stabilizer and an axial extension therefor
US4502818A (en) * 1980-03-28 1985-03-05 Elders G W Roof support pin
US5147151A (en) * 1991-08-23 1992-09-15 Hipkins Jr Edward C Washer insert for bearing plate
US8801337B2 (en) * 2008-01-11 2014-08-12 Dsi Underground Systems, Inc. Method of using a dome headed roof bolt
US20110052332A1 (en) * 2009-09-01 2011-03-03 Fci Holdings Delaware, Inc. Yielding Bolt and Assembly
US8721227B2 (en) * 2009-09-01 2014-05-13 Fci Holdings Delaware, Inc. Yielding bolt and assembly

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